One of my customers asked me for a quatrefoil logo. I was not sure what that was although I have actually designed and used the shape I did not realise it had a name, until I looked it up on line.
So below is a description of a quatrefoil.
In art, architecture, and traditional Christian symbolism, the quatrefoil is a type of decorative framework consisting of a symmetrical shape which forms the overall outline of four partially overlapping circles of the same diameter. The word quatrefoil means "four leaves", from Latin quattuor, four, plus folium, a leaf.) and applies to general four-lobed shapes in various contexts. It is also used as a heraldic charge.